Trulock is my go to co. for after-market chokes. I have one I share on my Brownings & another for a Benelli. I got mine to try to get the best pattern/range shooting larger shot for predators, like T, BB, #4 buckshot. With the back-bored barrel in the Browning I went with a .680 Precision Hunter choke & the Benelli just a hair tighter because of the slightly smaller barrel diameter. I did pattern the chokes with the larger shot & am very pleased. Of course I didn't try every combination available. I also use the choke for turkey hunting usually shooting #6 Hevi-Shot.
Are you looking to get better patterns at the skeet range or bird hunting? At the time I was looking I called up the company & asked several questions. They were rather helpful.
